their demand -- the withdrawal of the russian army from chechnya. the russian army's pumped in a toxic gas to knock out the attackers, but it also killed more than 100 of the hostages. 10 years later, russia is still battling islamist rebels in the north caucasus, who want to break away from moscow. there are fears terrorists might strike moscow again. experts say the government is not doing enough to find a solution to the conflict. >> the kremlin talks a lot about the north caucasus, but it does not do much. they say they want to address the problems and deal with unemployment, make economic reforms, but hardly anything changes. >> this year, as every year, olga is marking the anniversary of the end of her ordeal. she says she is grateful she survived, but the fear something similar could happen again remains. >> how can a nation come to terms with a past that includes a dictator, torture, and political repression? >> can agents that have -- can nations that have these terrible chapters in, learn from each other? those were the questions in berlin